#include<bits/stdc++.h>
using namespace std;

#define ll long long

void solve(){
    ll k, cur = 0, a = 1;
    cin >> k;
    while(1){
        cur += a + 1;
        if(k < cur){
            cout << "a\n";
            return;
        }else if(k == cur){
            cout << "b\n";
            return;
        }
        a++;
    }
}

int main(){
    ios_base::sync_with_stdio(0), cin.tie(0);
    int t = 1;
    cin >> t;
    while(t--){
        solve();
    }
    return 0;
}